Feat: Discover zukunftssicher (Recency-Score) + Agent-Hirn (Hermes) im Modell-Manager

- discover.rank_runnable: Score aus Fit + Recency (lastModified, Halbwertszeit ~9 Mon)
  + Capability (params, log) + Popularity (downloads, log) -> neuere Generationen bevorzugt.
- Agent-Hirn: neuer GET /api/agent/brain (aktuelles hermes-Modell + bestes NousResearch-
  Hermes-Update, versions-aware via Hermes-X.Y-Parsing). Cockpit zeigt "Agent-Hirn (Hermes)"-Karte
  mit aktuellem Brain + Aktualisieren-Button, wenn NousResearch eine neuere Generation hat
  (z.B. Hermes-4-14B -> Hermes-4.3-36B). Update installiert mit Rolle hermes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/lib/queries.ts

@@ -9,6 +9,7 @@ import {
   type ConnectResp,
   type DiscoverResp,
   type DraftsResp,
+  type HermesBrainResp,
   type Health,
   type Job,
   type Memory,
@@ -30,6 +31,7 @@ export const qk = {
   jobs: ["jobs"] as const,
   tokenStats: ["token-stats"] as const,
   agentStatus: ["agent-status"] as const,
+  hermesBrain: ["hermes-brain"] as const,
   updates: ["updates"] as const,
   discover: ["discover"] as const,
   drafts: (target?: string) => ["drafts", target ?? ""] as const,
@@ -66,6 +68,10 @@ export const useTokenStats = (refetchInterval = 3_000) =>
 export const useAgentStatus = (refetchInterval = 5_000) =>
   useQuery({ queryKey: qk.agentStatus, queryFn: () => api<AgentStatus>("/api/agent/status"), refetchInterval })
 
+// Agent-Hirn (Hermes) + bestes NousResearch-Update. Selten pollen (HF-Abfrage).
+export const useHermesBrain = (refetchInterval = 60_000) =>
+  useQuery({ queryKey: qk.hermesBrain, queryFn: () => api<HermesBrainResp>("/api/agent/brain"), refetchInterval })
+
 export const useUpdates = (refetchInterval?: number) =>
   useQuery({ queryKey: qk.updates, queryFn: () => api<UpdatesResp>("/api/maintenance/updates"), refetchInterval })